websem: repair ordinary-opacity source precision - #142
Conversation
Carry complete isolated source domains across rframe, prepare active blur sources once, and quarantine unrepresented composition profiles. Reopen both opacity checklist rows; retain the radial element own-row precedent. Add 36 immutable Chromium cells, 17 named refusal witnesses and actual-CLI assertions. Independent manual TICK/LAW and REPRO pass; no Workflow runner was exposed.
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WalkthroughThe change adds isolated opacity source domains across the public frame API, SVG compilation, n0 execution, fixtures, assertion evaluation, browser identity capture, and CI gates. It also adds source-domain refusals, rendering coverage, engine-only obligations, and canonical reference checks. ChangesOpacity source-domain pipeline
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~60 minutes Change: Bug fix · Severity of issue fixed: Medium Sequence Diagram(s)sequenceDiagram
participant SVGCompiler
participant RFrame
participant N0
participant AssertionRunner
participant ChromiumReference
SVGCompiler->>RFrame: attach IsolatedSourceDomain
RFrame->>N0: emit opacity scope with source domain
N0->>N0: validate and clip mapped source bounds
AssertionRunner->>ChromiumReference: capture environment and reference output
AssertionRunner->>AssertionRunner: evaluate engine and reference obligations
Merge Risk: 🟡 Moderate · up to Changes to the Chromium capture module can fail the engine-only gate even when all engine and baked-reference checks pass. Separate these gate inputs before merging. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 57.29% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 96 functions across 27 files. (8 skipped: 8 unsupported.)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Landing paused: the Chromium reference is not environment-invariantPR remains draft and unmerged at Both runs identify Chromium 149.0.7827.55, the unchanged sole capture module SHA-256
For all six rendering cases, Linux n0, local n0 and the committed baked pixels agree exactly. All three .998 cases also agree across Chromium. Repeats are stable and both report integrity lists are empty. Therefore this is not an engine-output regression in these cases, but n0 does not match the observed Linux Chromium output for the high-opacity cases. Independent artifact review re-decoded the PNGs and checked 96 recorded PNG/RGBA identities plus source/tool identities. It confirmed the split. The shear refusal's Chromium observations also differ by 1,192 pixels at delta 1; its exact named-refusal assertion still passes. The Linux observations are measured, not celled. This establishes an environment association, not its cause: OS, CPU architecture, browser build/backend or another setting has not been isolated. Selecting whichever image agrees with n0 is not permitted by #140. A canonical reference environment must be explicitly investigated and reviewed before resuming this expansion; a version string alone is insufficient evidence of identical raster behavior. Failed assertion job · original report and images The original three-case pilot and all 40 tool-contract tests passed in that job. Automated review generated no actionable code comments. Other CI jobs may still finish independently; no all-CI-green or merge is claimed. The branch is clean and pushed; main remains |
Investigation update — still draft; two distinct landing blockersThe Chromium rounding split is explained; the proposed reference-environment contract is recorded for review in gridaco/nothing#140. Measured, not celled: source-only reductions of the three The fresh local investigation ran 16 source variants twice in both actual CLI admissions (64 executions), with stable exact Chromium matches and no degradation. A second arithmetic implementation confirmed source-byte recovery and complete output equality; this was a same-agent cross-check, not independent-person review. A separate engine failure finished after the earlier pause: the full Linux Rust job fails The earlier “both n0 builds agree” observation applies to the six described opacity assertions, not every new fixture or all CI. The arc failure remains mandatory and is not excused by reference-environment policy. No tracked changes during this investigation; head remains |
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✅ Action performedReview finished.
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Inline comments:
In `@packages/grida-reftest/svg-assertions/runner.ts`:
- Around line 660-679: Update the engine readiness calculation in the report
construction, using the engine verdict mapping and its associated integrity
input, to filter out the capture-module-hash-drift marker from engine
evidence/problems and the engine gateReady integrity array. Preserve this marker
in the full integrity input used for the combined reference gate.
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ℹ️ Review info
⚙️ Run configuration
Configuration used: Organization UI
Review profile: CHILL
Plan: Advanced
Run ID: bfbd5442-a0a8-4354-b535-e6af962697a1
📒 Files selected for processing (20)
.github/workflows/consolidation-gates.yml.github/workflows/test-crates.ymlcrates/n0_cli/README.mdcrates/websem/src/svg_path.rscrates/websem/tests/reftest_oracle.rsdocs/wg/consolidation/svg-engine-of-record.mdfixtures/web-first/README.mdpackages/grida-reftest/svg-assertions/README.mdpackages/grida-reftest/svg-assertions/capture-identity.test.tspackages/grida-reftest/svg-assertions/capture-identity.tspackages/grida-reftest/svg-assertions/capture-worker.tspackages/grida-reftest/svg-assertions/cli.tspackages/grida-reftest/svg-assertions/model.test.tspackages/grida-reftest/svg-assertions/model.tspackages/grida-reftest/svg-assertions/opacity-source.jsonpackages/grida-reftest/svg-assertions/pilot.jsonpackages/grida-reftest/svg-assertions/reference-environment.test.tspackages/grida-reftest/svg-assertions/reference-environment.tspackages/grida-reftest/svg-assertions/report.tspackages/grida-reftest/svg-assertions/runner.ts
🚧 Files skipped from review as they are similar to previous changes (3)
- fixtures/web-first/README.md
- crates/n0_cli/README.md
- docs/wg/consolidation/svg-engine-of-record.md
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Summary
Repair the retained ordinary-opacity precision cases in #136 and quarantine unsupported source combinations. Keep that issue open for the remaining composition profiles. This PR is for engine contributors maintaining the resolved-source and rendering boundaries.
rframe, separate from the numeric factor. Both near-unit restoration routes consume it. The enclosure is not geometry, damage, visible ink, a viewport or an allocation hint.An independent contract maintainer designed the
rframeboundary before producer/consumer adaptation. Existing blend-domain compatibility names remain available.Measured verdict and evidence
Initial actual-CLI strict/best-effort repeats reproduced these failures against independently baked Chromium:
The repaired local cases match their own immutable Chromium images exactly. The no-opacity blur control also changes from 30 differing pixels / delta 1 to exact. Authored arc and native-circle controls keep separate references; substituting geometry is not the repair.
36 new positive cells bring the primitive corpus to 1,575. Seventeen new named-refusal witnesses bring the register to 368. The 16 sampled frames, 16 exact text cells and eight geometry witnesses are unchanged. The filter estate is 459 cells, including six new blur controls. All previous 1,539 primitive records and oracle bytes are unchanged. New cells entered only through
just add; bakes never overwrite oracles.Both
opacitychecklist rows reopen; no row gains a tick. Independently mapped contributors, shear/unequal scale, paths, complex strokes, incomplete contributors and unsupported source placement retain stable refusals. Attributable clients roll back transactionally; root/host failures are document-level in both admissions. Bare multi-operation paint-server sources feeding filters/masks refuse separately even without partial opacity. This does not claim to solve #88 or the remaining source-composition profiles.Two independent cross-platform problems
The reference investigation explains every retained near-unit Chromium platform difference with the pinned Skia NEON versus x86 source-over formulas: blur 1,926, pattern 217 and radial 1,168 differing pixels, each maximum delta 1 (measured, not celled). A browser version string is not an environment identity.
Manifest v2 therefore declares the actual browser ABI/hash/revision, full host kernel identity and effective raster status. Captures remain through the unchanged hash-pinned module. Two obligations use one set of immutable references:
The Linux seam job selects the explicitly labelled engine-only obligation; a separately required ARM job checks the combined obligation. The aggregate requires both. Reports always retain
engine_readyseparately from combinedgate_ready; engine-only success cannot certify reference reproduction.macos-26provisions the runner; it is not the identity pin. Original bake provenance is not retroactively rewritten. Diagnostic CI reproduced all nine opacity assertions on ARM before enforcing this profile (measured, not celled).The distinct Linux engine failure changed 25 pixels / delta 3 in the authored-arc blur. Retained resolved frames isolate conic weights, not the painter: the reference's
atan2f(+-0, negative finite)returns+-0x40490fda, unlike the host-independent PI constant and Linux answer. Explicitly preserving this measured negative-axis boundary produces the reference conics on both hosts. This is not a claim of universal transcendental portability. The existing exact cell and numeric boundary tests guard the fix.Etiology: source preparation/enclosure defects are repaired at the producer/consumer contract; the arc defect is a host-math API precision dependency, repaired at the SVG arc boundary. No host flag reaches the renderer, no alternative golden, no rounded conic weight and no geometry substitution.
Sensitivity and verification
Earlier deliberate regressions failed the blur preparation, source declaration and five zero-area exclusion cells, then were restored. September 18 adds:
0x40490fdbmakesjust gatefail at the exact original 25 pixels / delta 3. Its complete PNG matches retained Linux Rust and actual-CLI failures exactly. Restore returns the full gate and STATUS to green.engine_readystays true andgate_readybecomes false. Scratch identity is not a new canonical reference.capture-module-hash-drift, despite exact rendering pairs: both readiness flags become false. Common run/instrument integrity remains mandatory in both obligations; this is intentionally distinct from reference-runtime identity.cargo clippy --locked --no-deps -- -D warnings, link checks and pre-PR OSS audit. The full localcargo test --locked -p cg -p csscascade -p rframe -p animation-sampling -p textlayout -p websem -p n0-model -p n0 -p n0_cli -p grida --no-fail-fastrun, including documentation tests, passed.No Workflow runner is exposed, so
.agents/workflows/verify-rung.jscannot be invoked throughscriptPath. Independent manual TICK/LAW and REPRO are the explicit fallback, not a claim that the saved Workflow ran. Prior reviews fixed the zero-area enclosure defect and a recorded delta typo. Renewed independent TICK/LAW and REPRO both passed with no must-fix or should-fix findings. REPRO freshly repeated the six-source/24-render matrix, full fixture gates and tool tests; checked all source/oracle hashes and retained sensitivity artifacts; and verified both enforced CI reports against this exact head. Automated review completed; its suggestion to exclude capture-hash drift from engine readiness was rejected with the actual-CLI contrast above and independently rechecked. The review thread is resolved.No golden, pinned capture module, tolerance, FLIP rule or conformance measure is changed. External I/O, text, generic damage/coverage and new filter vocabulary remain separate.